Overview

• The UK recorded its hottest May 1 ever, with 29.3°C at Kew Gardens and 27.4°C in Cardiff, Wales' highest May temperature on record.
• Government guidance urges residents to close curtains and blinds during the day to block direct sunlight and reduce indoor heat buildup.
• Energy suppliers like OVO Energy advise against opening windows during peak heat to prevent warm air from entering homes.
• Experts recommend strategic ventilation, such as creating cross-breezes and opening windows at night when outdoor temperatures are cooler.
• Well-insulated UK homes, designed for colder winters, are particularly vulnerable to overheating during prolonged warm weather.